N-phase sinewave converter

Abstract

A DC to AC sinewave converter having an FET with its gate terminal coupled to a switching signal which turns the FET on and off. A pair of parallel, oppositely conductive diodes couples the drain terminal of the FET to a resonant circuit that is responsive to a source of DC voltage. A clamping diode is connected between the parallel diodes and the source terminal of the FET for preventing the drain and source terminals from being reverse biased.

What is claimed is: 
     
       1. a sinewave converter comprising: a switching transistor having (a) a control terminal for receiving a switching signal and (b) first and second controlled terminals which are controllably coupled by a conductive path when said transistor is turned on pursuant to said switching signal;   a resonant circuit responsive to a source of DC voltage; and   means for conductively coupling said first and second controlled terminals of said switching transistor to said resonant circuit and for preventing said first and second terminals from being reverse biased wherein said coupling means includes a clamping diode and oppositely conductive, parallel connecting diodes in series with said clamping diode.   
     
     
       2. A sinewave converter comprising an FET having its gate terminal coupled to a switching signal which turns said FET on and off;   a resonant circuit responsive to a source of DC voltage;   bilateral unidirectional current conductive means for conductively coupling the drain of said FET to said resonant circuit; and   clamping means connected between said bilaterally conductive means and the source terminal of said FET for preventing said drain and source terminals from being reverse biased.   
     
     
       3. The sinewave inverter of claim 2 wherein said bilateral current conductive means provides a voltage drop in the direction of current conduction. 
     
     
       4. The sinewave inverter of claim 3 wherein said bilateral current conductive means comprises oppositely conductive, parallel connected diodes. 
     
     
       5. The sinewave inverter of claim 2 wherein said clamping means includes a clamping diode.